Bibliography (8):

1. https://arxiv.org/abs/2006.16934

2. https://arxiv.org/abs/2004.06165

3. https://arxiv.org/abs/2012.15409

4. https://data.wudaoai.cn/

5. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Pre-training_(machine_learning)  :

      https://en.wikipedia.org/wiki/Pre-training_(machine_learning)

   2. https://en.wikipedia.org/wiki/Question_answering  :

      https://en.wikipedia.org/wiki/Question_answering

   3. https://en.wikipedia.org/wiki/Image_captioning  :

      https://en.wikipedia.org/wiki/Image_captioning

   4. https://en.wikipedia.org/wiki/Vision_language  :

      https://en.wikipedia.org/wiki/Vision_language